My post on the thread you point to is what might be happening when reading. This has continued and I feel might have worsened the 4.x.x firmware. I never found a way around it except to be very careful when highlighting.
But, it seems to be happening less with 4.8.10956. There were changes in this firmware to how the highlighting worked. This has improved the overall speed of highlighting and I think improved some other parts of the highlighting. The hang might have been fixed, or at least reduced a lot, but these changes.
If you want to try 4.8.10956, either patch it, or set the font to something other than "Publisher default" or the "Kobo..." fonts. The issues describe with this firmware version can still happen, but are much less likely. And if you decide you don't like it, manually installing 4.7.10413 over it will be safe. But, I am also hoping to see a replacement for 4.8.10956 soon.
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